Results 1 to 10 of about 11,831 (256)

Stable potassium isotopes (41K/39K) track transcellular and paracellular potassium transport in biological systems [PDF]

Frontiers in Physiology, 2022
As the most abundant cation in archaeal, bacterial, and eukaryotic cells, potassium (K+) is an essential element for life. While much is known about the machinery of transcellular and paracellular K transport–channels, pumps, co-transporters, and tight ...
John A. Higgins, Danielle Santiago Ramos, Stefania Gili, Cornelia Spetea, Cornelia Spetea, Scott Kanoski, Darren Ha, Alicia A. McDonough, Jang H. Youn   +8 more
doaj   +4 more sources

Analysis of urinary potassium isotopes and association with pancreatic health: healthy, diabetic and cancerous states [PDF]

Frontiers in Endocrinology
BackgroundMore than 700 million people worldwide suffer from diseases of the pancreas, such as diabetes, pancreatitis and pancreatic cancer. Often dysregulation of potassium (K+) channels, co-transporters and pumps can promote development and progression
Kathrin Schilling, Kathrin Schilling, Heng Chen, Ronald A. Glabonjat, Silvana Debernardi, Oleg Blyuss, Ana Navas-Acien, Alex N. Halliday, Tatjana Crnogorac-Jurcevic   +8 more
doaj   +2 more sources

Estimating in vivo potassium distribution and fluxes with stable potassium isotopes.

Am J Physiol Cell Physiol, 2022
Extracellular potassium (K+) homeostasis is achieved by a concerted effort of multiple organs and tissues. A limitation in studies of K+ homeostasis is inadequate techniques to quantify K+ fluxes into and out of organs and tissues in vivo. The goal of the present study was to test the feasibility of a novel approach to estimate K+ distribution and ...
Youn JH, Oh YT, Gili S, McDonough AA, Higgins J.   +4 more
europepmc   +3 more sources

K isotopes trace temporal silicate weathering intensity [PDF]

Nature Communications
Silicate weathering alters the biogeochemical compositions of the lithosphere, hydrosphere, and atmosphere, and thereby regulates both nutrient cycling and habitable temperatures on Earth, but tracing silicate weathering effectively remains a challenge ...
Long-Fei Gou, He Sun, Hai-Ou Gu, Philip A. E. Pogge von Strandmann, Wenshuai Li, David J. Wilson, Jun Xiao, Zhi-Qi Zhao, Albert Galy, Zhangdong Jin   +9 more
doaj   +2 more sources

The activity concentrations of radionuclides 226Ra, 232Th and 40K of soil samples in the case of Metekel Zone, Ethiopia

EPJ Nuclear Sciences & Technologies, 2022
In this paper, we have studied the concentration levels and corresponding radiological hazard indices of natural radioactive elements such as radium-226, thorium-232, and potassium-40 in soil samples collected from Metekel Zone, Ethiopia.
Abate Tadesse
doaj   +1 more source

Isotopic Fractionation of Potassium by Diffusion in Methanol [PDF]

ACS Omega, 2019
We present the results of experiments involving the isotopic fractionation by diffusion of K+ cations in methanol at 298 K along with supporting molecular dynamic simulations. The experiments, using glass Rayleigh fractionators filled with a methanol solution of KCl, constrain the ratio of the individual diffusivities of 41K and 39K (D 41K/D 39K) in ...
John N. Christensen, Amy E. Hofmann, Donald J. DePaolo   +2 more
openaire   +4 more sources

Bohr-Weisskopf effect in the potassium isotopes

Physical Review C, 2023
The magnetic hyperfine structure constants have been calculated for low-lying levels in neutral potassium atom taking into account the Bohr--Weisskopf (BW) and Breit--Rosenthal (BR) effects. According to our results the $4p_{1/2}$ state of K~I is free from both BR and BW corrections on the level of the current theoretical uncertainties.
Yu. A. Demidov, M. G. Kozlov, A. E. Barzakh, V. A. Yerokhin   +3 more
openaire   +2 more sources

The Mass Resolution of Ca, K Isotopes and CO, N2 and C2H4 Isobars in Isotopes Separator On-Line trap Mass spectrometry

Journal of Nigerian Society of Physical Sciences, 2020
In Isotopes separator on-line trap, ions are trapped, cooled, accumulated, bunched and isotopes or isobars are separated, cyclotron frequencies are determined, which are followed by time of flight mass resolution.
Dyavappa B M
doaj   +1 more source

The progress and prospects of potassium stable isotopes in hydrogeochemistry

Shuiwen dizhi gongcheng dizhi, 2023
Chemical weathering of silicate minerals is an important source for Ca, Mg, Na and K. However, in comparison with other major elements (e.g., Ca, Mg and Na) in waters, how K behaves during water-rock interaction remains poorly understood.
Taotao JI, Xiaowei JIANG
doaj   +1 more source

Geochemistry and cosmochemistry of potassium stable isotopes

Geochemistry, 2021
Stable potassium isotopes are one of the emerging non-traditional isotope systems enabled in recent years by the advance of Multi-Collector Inductively-Coupled-Plasma Mass-Spectrometry (MC-ICP-MS). In this review, we first summarize the geochemical and cosmochemical properties of K, its major reservoirs, and the analytical methods of K isotopes ...
Kun, Wang, Weiqiang, Li, Shilei, Li, Zhen, Tian, Piers, Koefoed, Xin-Yuan, Zheng   +5 more
openaire   +3 more sources